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Severe Thunderstorm Watch — Clinton County, IA, Jackson County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, De Kalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, La Salle County, IL, Lee County, IL, Livingston County, IL, McHenry County, IL, McLean County, IL, Marshall County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Lake County, IN, Newton County, IN, Columbia County, WI, Dane County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Winthrop Harbor to Wilmette Harbor IL, LM, Wilmette Harbor to Northerly Island IL, LM, Northerly Island to Calumet Harbor IL, LM, Calumet Harbor IL to Gary IN, LM, Gary to Burns Harbor IN, LM, Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake, LM, Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake, LM, Dubuque County, IA, Clayton County, IA, Grant County, WI, Richland County, WI
Issued
2:55 PM CDT · ven., août 21 2026
Expires
10:00 PM CDT · ven., août 21 2026
Issuing Office
NWS KWNS

Affected Areas

Clinton County, IA Jackson County, IA Scott County, IA Boone County, IL Bureau County, IL Carroll County, IL Cook County, IL De Kalb County, IL DuPage County, IL Ford County, IL Fulton County, IL Grundy County, IL Henry County, IL Iroquois County, IL Jo Daviess County, IL Kane County, IL Kankakee County, IL Kendall County, IL Knox County, IL Lake County, IL La Salle County, IL Lee County, IL Livingston County, IL McHenry County, IL McLean County, IL Marshall County, IL Mercer County, IL Ogle County, IL Peoria County, IL Putnam County, IL Rock Island County, IL Stark County, IL Stephenson County, IL Tazewell County, IL Whiteside County, IL Will County, IL Winnebago County, IL Woodford County, IL Lake County, IN Newton County, IN Columbia County, WI Dane County, WI Green County, WI Iowa County, WI Jefferson County, WI Kenosha County, WI Lafayette County, WI Rock County, WI Sauk County, WI Walworth County, WI Winthrop Harbor to Wilmette Harbor IL, LM Wilmette Harbor to Northerly Island IL, LM Northerly Island to Calumet Harbor IL, LM Calumet Harbor IL to Gary IN, LM Gary to Burns Harbor IN, LM Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake, LM Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake, LM Dubuque County, IA Clayton County, IA Grant County, WI Richland County, WI

Official Bulletin

722
WOUS64 KWNS 211954
WOU0

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 610
NWS STORM PREDICTION CENTER NORMAN OK
255 PM CDT FRI AUG 21 2026

SEVERE THUNDERSTORM WATCH 610 IS IN EFFECT UNTIL 1000 PM CDT
FOR THE FOLLOWING LOCATIONS

IAC043-045-061-097-163-220300-
/O.NEW.KWNS.SV.A.0610.260821T1955Z-260822T0300Z/

IA
.    IOWA COUNTIES INCLUDED ARE

CLAYTON              CLINTON             DUBUQUE
JACKSON              SCOTT
$$

ILC007-011-015-031-037-043-053-057-063-073-075-085-089-091-093-095-097-099-103-105-111-113-123-131-141-143-155-161-175-177-179-195-197-201-203-220300-
/O.NEW.KWNS.SV.A.0610.260821T1955Z-260822T0300Z/

IL
.    ILLINOIS COUNTIES INCLUDED ARE

BOONE                BUREAU              CARROLL
COOK                 DE KALB             DUPAGE
FORD                 FULTON              GRUNDY
HENRY                IROQUOIS            JO DAVIESS
KANE                 KANKAKEE            KENDALL
KNOX                 LAKE                LA SALLE
LEE                  LIVINGSTON          MARSHALL
MCHENRY              MCLEAN              MERCER
OGLE                 PEORIA              PUTNAM
ROCK ISLAND          STARK               STEPHENSON
TAZEWELL             WHITESIDE           WILL
WINNEBAGO            WOODFORD
$$

INC089-111-220300-
/O.NEW.KWNS.SV.A.0610.260821T1955Z-260822T0300Z/

IN
.    INDIANA COUNTIES INCLUDED ARE

LAKE                 NEWTON
$$

WIC025-043-045-049-055-059-065-103-105-111-127-220300-
/O.NEW.KWNS.SV.A.0610.260821T1955Z-260822T0300Z/

WI
.    WISCONSIN COUNTIES INCLUDED ARE

DANE                 GRANT               GREEN
IOWA                 JEFFERSON           KENOSHA
LAFAYETTE            RICHLAND            ROCK
SAUK                 WALWORTH
$$

LMZ740-741-742-743-744-777-779-220300-
/O.NEW.KWNS.SV.A.0610.260821T1955Z-260822T0300Z/

CW

.    ADJACENT COASTAL WATERS INCLUDED ARE

WINTHROP HARBOR TO WILMETTE HARBOR IL

WILMETTE HARBOR TO NORTHERLY ISLAND IL

NORTHERLY ISLAND TO CALUMET HARBOR IL

CALUMET HARBOR IL TO GARY IN

GARY TO BURNS HARBOR IN

LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM
OFFSHORE TO MID LAKE

LAKE MICHIGAN FROM WILMETTE HARBOR TO MICHIGAN CITY IN 5NM
OFFSHORE TO MID LAKE

$$
ATTN...WFO...ARX...LOT...MKX...ILX...DVN...